Through-ringing repeater-circuits



lJ. E. TOGMEY. THROUGH mame REPEATER cmcuns I APPLCAON FILED IAN. 3||197 1,364,159. Patented Jan. 4, 1921.

2 SHEETS-SHEET 2.

CY l INVENTOR` JFYEUmg L@ lmzofm ATTORNEY UNITED STATES PATENT oFric E,.y f

JOHN F. TOOMEY, or NEW YORK, N. Y., AssfIGNon To AMERICNTELErnONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW YORK.

THROUGH-RINGING RErnaTnn-Orncurrs.

.To all whom t may concern.' y y Be .it known that I, JOHN F. TOOMEY, residing at NewYork city, in the county of New York and State of New York, have invented certain lm rovements in Through- Ringing Repeatenbircuit's, of which the ollowing is a specification. i This invention relates to telephone repeater circuits and more particularly it relates to two-way two-repeater circuits with which is associated means for relaying ringing current or other signaling current as distinguished from telephone. current. Its object is to provide means for automatically associating the ringing relay with the system upon the receipt of ringing current, for prof tecting the telephone repeaters from the incoming and relayed ringing current and for disconnecting the ringing relay and its associated apparatus upon the cessation of' the incoming ringing current. My invention is best understood by reference to the accompanying drawings in which Figures 1 and 2 when placed side by side constitute a diagram of a two-way'two-repeater telephone station.

Referring to the drawing a twoway tworepeater station is shown which embodies the arrangements of my invention for relaying rinoing current past said repeater station. rllhe repeater arrangement comprises two vacuum tube repeaters R and R',

and their associated apparatus, repeater R being adapted to receive signals transmitted to the station over line 1 and to transmit amplified copies of said signals from the station over line 1'.' Circuit 2 is the input circuit. of repeater R and is normally bridged across line 1 through contacts 4, 4 of relay 5,

while its output circuit 3 is inductively asso ciated with line 1. Input circuit 2 of repeater R is normally bridged across yline 1 while its output circuit 3 is inductively associated with line 1, land said repeater is therefore adapted to receive signals transmitted. to the station over line 1 and `toretransmit, after amplification, said signals out over line 1i Since said repeaterstation consists of two ksymmetrical halves or ysections, corresponding elements in said halves vwill be denoted by the same numerals, with and without primes respectively. Since the f operation of 'said telephone repeaters is yno part of myinvention and is well known, the

, Specification of Letters Patent.` 'y' RatentedJan. 4, 1192i. Application med January 31, 1917. serial No.:145,672. y

description of the invention Vwill be limited to ythe arrangements concernedywith the transmission of rringing currents from line 1 to line 1 and `vice-versa.` l

Assume that-'a ringing current or other ,currenthaving characteristics difering rom those Of'vtelephonic or signaling currents which actuate they repeater'is transmittedtoV the station over' line 1.v This ringing current passes from line 1y through contacts4, 4 of relay anol due to its different characteristic,

energizes relay 6, thereby opening contact 7, f

deenergizing relay 8 and closing Contact r9.

vRelay 6 is in parallel with input circuit '2 of repeater R but is not operated by the relatively feeble high frequency telephonie currents. 4The closing'of contact 9l establishesa circuit from ground through battery 10, the winding of relay ductors 12 and 13 through the winding of relay 5" andthencethrough contact 9, conductor 14 andthe winding of relay 15 yback to ground, with the result that relays 11, 5

11, thence through con# and 15 are simultaneouslyenergized. The actuation of relay 11 opens contacts 16. and

16 and closes contacts' 17 .and 17. The closingv o'fcontact 17 short-circuits the primary of repeatingcoil v18 `while the opening ofy contact lopen-circuits input circuit .2 thus cutting repeater R outof 'serviceand remov#` ing a shunt which normally exists across re# lay 6. Theoperationsof contacts 16 and 17 in precisely similar .manner cut repeater R out of serviceand remove a shunt which n l p The repeaters 'are therefore protected. fromy Vthe normallyeXists across relay 6.

ringing currentby the operation of relay 11 and it. will be clear that repeater Ris aifect ed by 'the ringing current onlyduring the "brief `interval between the arrival` of the ringing current and the actuation of relayll.

4, 4" andcloses contacts 19k', 19thereby disconnecting rline 1 from the repeater system andconnecting' it to circuit 20 which pro- -vides an auxiliary path for thetransm'iss'ion of `ringing current. The actuation Jof rev The actuation of relay 5 openscontacts- 'no d the Winding -of relay 23 to battery thereby causing relay 23 to operate and connect the 133 cycle ringing current generated by interrupter 26, *overV circuit 23 through contacts 29, 29, to circuit 20 and thence through contacts 19 19 of relay 5 to line 1. It will be seen that since relay 5 is not energized circuit 20 is connected to line 1 only and vnot to line 1 so that the relayed ringing current is transmitted out over line 1 only.

To summarize'the operations traced in detailabove, the arrival of ringing current over line 1 initiates a cycle of operations commencing with the actuation of relay 6 which results in cutting the input circuits of repeaters R and R out ot' service, thereby protecting said repeaters from the ringing current` disconnecting line 1 from the repeater system and connecting it to the output circuit of the ringing interrupter and in setting the interrupter in operation.

The position of all the relays is controlled either by relay y6 or 6 so that the above described circuit connections remain established so long as relay 6 is energized by the incoming ringing current over line 1. lVhe-n said'incoming ringing current ceases the circuit connections or repeater operation are restablished as follows:

With the cessation ot ringing current on line 1 relay 6 is de'e'nergized, contact 7 is thereby closed and the energizing circuit of relay 8 is closed through said contact and said relay is energized. As a consequence of the actuation of relay 8, which together with relay 8 is normally energized for repeater operation, contact 9 is opened thus putting the contacts of relay 8 in the same position as those of relay 8. The opening of contact 9 opens the circuit through the windings of relays 11, 5 and 15, thus deenergizing said relays and restoring the circuitsto normal.

The denergizing of the relay 5 results in the opening of contacts 19', 19 and the closling of contacts e', 4 thereby disconnecting line 1 from circuit 20 and connecting it with the repeater system. The de'e'nergizing of relay 15 opens contacts 22 and 24: thereby denergizing relay 23 and opening circuit 25 of'interrupter 26. Relay 23 in releasing opens the connections between circuits 20 and 28 thereby disconnecting the interrupter from circuit 20. It will then be seen that with the exception of relays 6 and 6 the apparatus associated with the ringing circuits and'operations iscompletely cleared from any connections with the system, leaving the.

normal connections and circuit arrangements for repeater operation. The windings of relays 6 and'6 remain bridged in parallel with repeater input circuits 2 and 2 respectivelybut any serious losses due to vthepresence of said relays may be minimized by*insertingretardation coils 31, 31 in series with the winding ot relay 6 and similar retardation coils 31', 31 in series with the winding of relay 6. These retardation coils may be designed to have a very high impedance at telephonie frequencies so that the shunting effect of said relays on the repeater input circuits is rendered negligible lVhen the ringing current is transmitted to the repeater station over line 1 the operation is precisely analogous to that described above. Relay 6 is energized instead of relay 6, thereby establishing a circuit for relays 11, 5 and 15 similar to that already traced for relays 11, 5 and 15. The actuation of relays 11 and 15 results in the same operations as have been already described. The actuation of relay 5 disconnects line 1 from the repeater system and connects it to circuit 20. Line 1 is consequently connected through circuit 2O to the outgoing circuit 28 of ringing relay 26 so that the relayed ringing current is transmitted out over line 1. Since relay 5 remains unactuated circuit 20 is not connected to line 1 and no relayed ringing current is transmitted back over line 1. The operations consequent upon the cessation of ringing current in line 1 and the denergization of relay 6 need not be described since they will be clearly understood from the previous description of the restoration of the repeater circuit connections consequent upon the denergization ot relay 6.

Vhile the invention has been shown as embodied' in a certain specific organization, it will be understood that it is capable of embodiment in many and varied forms without departing from the spirit of the appended claims.

Vhat is claimed is:

1. In a signaling system two line sections for transmitting signals of different characteristics, a device responsive to signals of one characteristic for relaying currents orp that characteristic derived from a local source from one line section to the other and means responsive to signals of another characteristic for relaying' signals of the latter characteristic derived from a local source from one line section to the other.

2. In a signaling system, two transmission line sections, a repeater system for interconnecting the line sections, an auxiliary path for interconnecting said line sections, and means whereby in response to ringing current from one line section ringing current from a local source is relayed to the other section over said auxiliary path.

3. A telephone transmission system comprising two line sections, a repeater for interconnecting the line sections and means responsive to ringing current transmitted over either line section to disconnect the repeater and apply a local source of ringing current to the other line section.

4. A telephone repeater system comprising two line sections, repeaters for interconnecting said line sections, an auxiliary 'circuit for connecting said line sections, said circuit being normally disconnectedl Jfrom both of said line sections, a source of ringing current and means responsive to ringing current received over either line section to disconnect the other line section from said repeaters, to connect it to said auxiliary circuit and to apply said source ofringing current to said auxiliary circuit.

5. A telephone repeater system comprising two line sections, repeaters normally connecting said line sections, a source of ringing current and means responsive to ringing current received over either line section to connect said source of ringing current to theother line section andl to ycut said repeaters out of circuit.

6. A telephone repeater system comprising two line sections, repeaters connecting said line sections, a normally idle source of ringing current and means responsive to ringing current received over either line section to set said source of ringing current into operation, to connect said source of ringing current to the other line section 'and to open the circuits of said repeaters.

7 In a telephone repeater system, the combination of two line sections, two oneway repeaters associated withrsaid line sections and aringing current relay,with means operable upon the receipt of ringing current over either line section for cutting the input circuits of said repeaters'out of service, means controlled by said first mentioned peaters out of service, for setting said source of ringing current into operation, and' for' disconnecting the other line section from :source vof ringing current.

n 9. A telephone transmission system comprising two line sections, a repeater for interconnecting thelin'e :sections and k'means responsive ,to signaling currentk transmitted over onefline section to disconnect thereu peater and apply ay local source ofsignalthe repeaters and connecting it .to saidV ing currentto the other line section;

f 10. A [telephone system comprising twok linesection's, means to interconnectsaid line sections fory transmission of amplified sigi naling currents of one character, and means responsive to currents kofi-another characteristicy from either line section vfor relaying similar currents from a local source tothe other line section. f o

11. telephonerepeater system compris- 'ing two line sections, repeaters connecting said line sections, ya ynormally idlek source of signaling current kand means responsive to signaling current received over eitherline section to set said source of signaling ycurrent into operation, yto connect said source of signaling `current tothe yotherline section tive.

and to renderk the repeaters inopera- 12. A. signaling system, two transmission line sectionsan amplifying meansl for in-i terconnecting the line 'sections and an aux iliary rpath for interconnecting said line sections and means responsive to signaling currents from one line sectionfor transmit- A ting rsimilar currents from a local source to the' otherl iary path. f n o `13.1n ka signalingsystem, two transmisline sectionover said auXil- Y f 90 sion line sections, means to connect said transmission line sections for amplifying f telephone currentstransmitted over said line sections and-means responsive to weak signalingcurrents cfa different character received over one line section for applying strengthened currents of the same character to the other-line section.

In testimony whereof, I `have signed my name "to vthis specification in the presence ofjtwo subscribing witnesses, this 19th kday ofJanuary--l917. f W

f JOHNSF. TooMEY. .Witnesses: f f u A f ALFRED KAUFMANN,v` f

` EDMUND SCHILP. 

